2015 Fiscal Year Final Research Report
A study of the evolution of asymptotic branch stars from the dawn of Universe to the present day.
| Project/Area Number |
25400233
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Hokkai-Gakuen University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
KOZASA Takashi 北海道大学, 理学研究院, 教授 (90263368)
SUDA Takuma 東京大学, 理学系研究科, 特任助教 (90374735)
KOMIYA Yutaka 東京大学, 理学系研究科, 特任研究員 (10455777)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 恒星進化 / 核種合成過程 / 宇宙初代星 / 銀河系形成史 / 元素の起源 / 漸近巨星分枝星 / 炭素星 / 質量放出 |
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| Outline of Final Research Achievements |
Recently, a number of extremely metal-poor stars have been observed, among which, a significant fraction of stars show peculiar abundances patterns, enriched with carbon and with heavy elements, synthesized via slow-process of neutron captures in asymptotic giant branch (ABG) stars and via rapid-process in some explosive events.
We study the evolutionary characteristics of AGM stars in particular of s-process in them systematically and by applying the theoretical results, we explore the formation mechanisms of carbon enhanced stars and the origins of neutron capture elements, either via slow- and/or rapid-processes under the environment of extremely metal deficiency in the early Universe. From these analyses, we reveal new aspects of star formation during early evolution of Milky Way and even preceding it and the properties of stars survive to date in the Galactic halo, which also gives a new insight into the search for the first stars in our Universe.
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| Free Research Field |
宇宙物理学
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